Flutter on iPhone Duo

Start here, because it is the thing that will waste your afternoon otherwise:

MediaQuery.displayFeatures is documented as "populated only on Android."

Flutter's foldable abstraction was built for Android hinges. On iPhone Duo it returns an empty list, no matter how folded the device is. The same goes for the dual_screen package (TwoPane, hingeAngleEvents) — Android-only in practice, and last published around three years ago.

So Flutter gives you no fold awareness on this device out of the box. What it does give you is most of what actually matters. Work in two tiers.

Tier 1 — works today, no native code

This is the bulk of a good port, and it is all pure Dart.

Resize correctly